package com.example.lenovo.spinnertest_329zay;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView tvinfo;
    private Spinner spinner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //定义数据源-----1
        String[] cities={"北京","上海","天津","大连"};
        //实例化适配器，绑定数据源----2
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                this, android.R.layout.simple_spinner_item, cities);
        //设置Spinner下拉按钮样式-----3
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // 将spinner与ArrayAdapter绑定----4
        spinner.setAdapter(adapter);
      //spinner条目选择事件--------5
        spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                tvinfo.setText("您选择的是："+parent.getItemAtPosition(position).toString());
            }
        });

    }
    private void init(){
        tvinfo=(TextView)findViewById(R.id.textView);
        spinner=(Spinner)findViewById(R.id.spinner);
    }
}
